The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 30, 2016
Filed:
Mar. 28, 2013
Nof Corporation, Shibuya-ku, Tokyo, JP;
Hiroki Yoshioka, Kawasaki, JP;
Midori Hirai, Kawasaki, JP;
Hitoshi Nakatsuhara, Kawasaki, JP;
Yuji Yamamoto, Kawasaki, JP;
NOF CORPORATION, Tokyo, JP;
Abstract
Provided is a multi-arm polyethylene glycol derivative having a narrow molecular weight distribution. A multi-arm polyethylene glycol derivative represented by the formula (1):[Z—YCHCHOX—O-L-O—XOCHCHY—Z]  (1)wherein, L represents a group selected from a linear or branched alkylene, arylene, or cycloalkylene group having two or more carbon atoms and combinations thereof, which may have an ether bond in a chain; X represents a dehydroxylation residue of a linear sugar alcohol having 5 or 7 carbon atoms; m is the number of polyethylene glycol chains bonded to X and represents 4 or 6; n is the average addition molar number of oxyethylene groups and n represents an integer of 3 to 600; Y represents a single bond or an alkylene group which may have an ester bond, a urethane bond, an amide bond, an ether bond, a carbonate bond, a secondary amino group, a urea bond, a thioether bond or a thioester bond in a chain or at an end; and Z represents a chemically reactive functional group.